Even thought about stepping up to electronic fuel injection to complicate your VW's simple carbureted engine? Even though EFI does add several extra components to your system, you can't deny its benefits.

3-wire feeders to detached structures that had no other parallel metallic pathways(eg. conduit, water and gas piping, communication cabling, etc.) were allowed up until the 2008 NEC code cycle.
From then on, 4-wire feeders have been required.
4-wire feeders to panels in attached structures have always been required.
3-wire feeder to detached(no longer allowed as of 2008):
4-wire feeder to detached:
4-wire feeder to attached structure:

Here's a cool attachment from Multitool. It turns nearly any bench grinder into a belt and disc grinder. This could be quite handy to have in the garage.
They come in several sizes. This one is the 36x2 version.Click Link Here